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##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2020 Tom Flanagan <knio@zkpq.ca>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, see <http://www.gnu.org/licenses/>.
##
from common.srdhelper import bitpack
from .lists import ADDRESSES
import sigrokdecode as srd
class SamplerateError(Exception):
pass
class SIRCError(Exception):
pass
class SIRCErrorSilent(SIRCError):
pass
class Decoder(srd.Decoder):
api_version = 3
id = 'ir_sirc'
name = 'IR SIRC'
longname = 'Sony IR (SIRC)'
desc = 'Sony infrared remote control protocol (SIRC).'
license = 'gplv2+'
tags = ['IR']
inputs = ['logic']
outputs = []
channels = (
{'id': 'ir', 'name': 'IR', 'desc': 'IR data line'},
)
options = (
{'id': 'polarity', 'desc': 'Polarity', 'default': 'active-low',
'values': ('active-low', 'active-high')},
)
annotations = (
('bit', 'Bit'),
('agc', 'AGC'),
('pause', 'Pause'),
('start', 'Start'),
('command', 'Command'),
('address', 'Address'),
('extended', 'Extended'),
('remote', 'Remote'),
('warning', 'Warning'),
)
annotation_rows = (
('bits', 'Bits', (0, 1, 2)),
('fields', 'Fields', (3, 4, 5, 6)),
('remotes', 'Remotes', (7,)),
('warnings', 'Warnings', (8,)),
)
def __init__(self):
self.reset()
def reset(self):
pass
def start(self):
self.out_ann = self.register(srd.OUTPUT_ANN)
self.active = self.options['polarity'] == 'active-high'
def metadata(self, key, value):
if key == srd.SRD_CONF_SAMPLERATE:
self.samplerate = value
def putg(self, ss, es, cls, texts):
self.put(ss, es, self.out_ann, [cls, texts])
def tolerance(self, ss, es, expected):
microseconds = 1000000 * (es - ss) / self.samplerate
tolerance = expected * 0.30
return (expected - tolerance) < microseconds < (expected + tolerance)
def wait(self, *conds, timeout=None):
conds = list(conds)
if timeout is not None:
to = int(self.samplerate * timeout / 1000000)
conds.append({'skip': to})
ss = self.samplenum
signals = super(Decoder, self).wait(conds)
es = self.samplenum
return signals, ss, es, self.matched
def read_pulse(self, high, time):
e = 'f' if high else 'r'
max_time = int(time * 1.30)
signals, ss, es, (edge, timeout) = self.wait({0: e}, timeout=max_time)
if timeout or not self.tolerance(ss, es, time):
raise SIRCError('Timeout')
return signals, ss, es, (edge, timeout)
def read_bit(self):
e = 'f' if self.active else 'r'
signals, high_ss, high_es, (edge, timeout) = self.wait({0: e}, timeout=2000)
if timeout:
raise SIRCError('Bit High Timeout')
if self.tolerance(high_ss, high_es, 1200):
bit = 1
elif self.tolerance(high_ss, high_es, 600):
bit = 0
else:
raise SIRCError('Bit Low Timeout')
try:
signals, low_ss, low_es, matched = self.read_pulse(not self.active, 600)
good = True
except SIRCError:
low_es = high_es + int(600 * self.samplerate / 1000000)
good = False
self.putg(high_ss, low_es, 0, ['{}'.format(bit)])
return bit, high_ss, low_es, good
def read_signal(self):
# Start code
try:
signals, agc_ss, agc_es, matched = self.read_pulse(self.active, 2400)
signals, pause_ss, pause_es, matched = self.read_pulse(not self.active, 600)
except SIRCError:
raise SIRCErrorSilent('not an SIRC message')
self.putg(agc_ss, agc_es, 1, ['AGC', 'A'])
self.putg(pause_ss, pause_es, 2, ['Pause', 'P'])
self.putg(agc_ss, pause_es, 3, ['Start', 'S'])
# Read bits
bits = []
while True:
bit, ss, es, good = self.read_bit()
bits.append((bit, ss, es))
if len(bits) > 20:
raise SIRCError('too many bits')
if not good:
if len(bits) == 12:
command = bits[0:7]
address = bits[7:12]
extended = []
elif len(bits) == 15:
command = bits[0:7]
address = bits[7:15]
extended = []
elif len(bits) == 20:
command = bits[0:7]
address = bits[7:12]
extended = bits[12:20]
else:
raise SIRCError('incorrect number of bits: {}'.format(len(bits)))
break
command_num = bitpack([b[0] for b in command])
address_num = bitpack([b[0] for b in address])
command_str = '0x{:02X}'.format(command_num)
address_str = '0x{:02X}'.format(address_num)
self.putg(command[0][1], command[-1][2], 4, [
'Command: {}'.format(command_str),
'C:{}'.format(command_str),
])
self.putg(address[0][1], address[-1][2], 5, [
'Address: {}'.format(address_str),
'A:{}'.format(address_str),
])
extended_num = None
if extended:
extended_num = bitpack([b[0] for b in extended])
extended_str = '0x{:02X}'.format(extended_num)
self.putg(extended[0][1], extended[-1][2], 6, [
'Extended: {}'.format(extended_str),
'E:{}'.format(extended_str),
])
return address_num, command_num, extended_num, bits[0][1], bits[-1][2]
def decode(self):
if not self.samplerate:
raise SamplerateError('Cannot decode without samplerate.')
while True:
e = 'h' if self.active else 'l'
signal, ss, es, matched = self.wait({0: e})
try:
address, command, extended, payload_ss, payload_es = self.read_signal()
names, commands = ADDRESSES.get((address, extended), (['Unknown Device: ', 'UNK: '], {}))
text = commands.get(command, 'Unknown')
self.putg(es, payload_es, 7, [n + text for n in names])
except SIRCErrorSilent as e:
continue
except SIRCError as e:
self.putg(es, self.samplenum, 8, [
'Error: {}'.format(e),
'Error',
'E',
])
continue
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